51494147 has 4 divisors (see below), whose sum is σ = 51520320. Its totient is φ = 51467976.

The previous prime is 51494119. The next prime is 51494167. The reversal of 51494147 is 74149415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51494147 - 2⁸ = 51493891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51494167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9872 + ... + 14157.

It is an arithmetic number, because the mean of its divisors is an integer number (12880080).

Almost surely, 2^51494147 is an apocalyptic number.

51494147 is a deficient number, since it is larger than the sum of its proper divisors (26173).

51494147 is a wasteful number, since it uses less digits than its factorization.

51494147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26172.

The product of its digits is 20160, while the sum is 35.

The square root of 51494147 is about 7175.9422377831. The cubic root of 51494147 is about 372.0368479128.

The spelling of 51494147 in words is "fifty-one million, four hundred ninety-four thousand, one hundred forty-seven".